To Next PageTo Next PageWhat to do if Yamaha Outboard Motor trim gauge always shows fully tilted up position?
If the trim gauge always shows a fully tilted-up position, the trim sender signal is not being received. Connect the pink lead connectors to each other.
Why Yamaha Outboard Motor boat speed and/or coolant pressure gauge does not show?
If the boat speed and/or coolant pressure gauge does not show, it is likely that the optional sensor has not been installed. Install the optional sensor.
General| Brand | Yamaha |
|---|---|
| Model | 25BMH |
| Category | Outboard Motor |
| Language | English |
Location and description of the outboard motor's serial number stamped on a label.
List of starting serial number blocks for different model names and codes.
Precautions for handling gasoline and preventing fires, emphasizing no smoking near heat or flames.
Importance of proper ventilation when operating engines indoors due to harmful exhaust gases.
Recommendations for wearing safety glasses, gloves, and protective shoes.
Guidelines on using genuine Yamaha oils, greases, and sealing fluids.
Advice on using correct tools, proper tightening torque, and maintaining hygiene.
Procedures for cleaning parts, oiling surfaces, and checking parts after assembly.
List of special tools for various measurement tasks, with part numbers.
Special tools required for removing and installing engine components, with part numbers.
Design of the power unit for fuel economy, serviceability, and durability, including crankshaft bearing details.
Overview of the ignition system components like flywheel magnet, coils, and CDI unit.
Explanation of how the ignition timing advance is managed when the shift is in neutral.
Details on the new structure enhancing cooling capacity and reducing outer surface temperature.
Information on the throttle grip and steering handle design for the 25B and 30H models.
Description of modifications to Bracket 1 and the addition of a rubber seal for better sealing.
Explains fuel/air mixture delivery for idling and slow speed operations via pilot jet and bypass holes.
Describes air/fuel mixture delivery through bypass holes and main nozzle in mid-speed range.
Details fuel/air mixture delivery via main jet, main air jet, and venturi at high speeds.
Explains the mechanical ignition timing advance system and its neutral operation.
